农民常常受制于天气的变化无常。

Farmers ___are often ___at ___the ___mercy ___of the weather.

小型企业只能任由突然的市场波动摆布。

Small businesses ___are ___at ___the ___mercy ___of sudden market changes.

该国脆弱的经济完全受全球金融趋势的支配。

The country's fragile economy ___is ___at ___the ___mercy ___of global financial trends.